AL and 2R birds grew three and two times faster than R birds from 2
to 20 weeks of age, and AL birds ate two to four times as much per day as R birds,
depending on age and on whether birds of the same age or weight were compared. Using
operant conditioning and a progressive ratio schedule of food reward, it was found that,
from 8 to 20 weeks, motivation to eat in R and 2R birds was as great after their daily meal
as before it, and was 3.6 and 1.9 times greater than that of maximally (72 h) deprived AL
birds. Another measure of feeding motivation, rate of eating, produced a similar index of
hunger in 2R birds, but not in R birds, whose food intake was probably constrained by
smaller crop capacity.
AL and 2R birds grew three and two times faster than R birds from 2to 20 weeks of age, and AL birds ate two to four times as much per day as R birds,depending on age and on whether birds of the same age or weight were compared. Usingoperant conditioning and a progressive ratio schedule of food reward, it was found that,from 8 to 20 weeks, motivation to eat in R and 2R birds was as great after their daily mealas before it, and was 3.6 and 1.9 times greater than that of maximally (72 h) deprived ALbirds. Another measure of feeding motivation, rate of eating, produced a similar index ofhunger in 2R birds, but not in R birds, whose food intake was probably constrained bysmaller crop capacity.
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